226 citations · 293 across the 4 of their papers we have counts for
5 papers · 1 filter
Quantum phase transition induced by Dzyaloshinskii-Moriya in the kagome antiferromagnet
O. Cepas, C. M. Fong, P. W. Leung +1
We argue that the S=1/2 kagome antiferromagnet undergoes a quantum phase transition when the Dzyaloshinskii-Moriya coupling is increased. For the system is in a moment-free…
How to detect weak emergent broken-symmetries of the Kagome antiferromagnet from Raman spectroscopy
O. Cepas, J. O. Haerter, C. Lhuillier
We show that the magnetic Raman response of a spin-liquid is independent of the polarizations of the light for triangular symmetries. In contrast, a ground-state that has a broken…
Theory of phonon-assisted "forbidden" optical transitions in spin-gapped systems
Olivier Cepas, Timothy Ziman
We consider the absorption of light with emission of one S(tot)=1 magnetic excitation in systems with a spin gap induced by quantum fluctuations. We argue that an electric dipole t…
Field-Driven Transitions in the Dipolar Pyrochlore Antiferromagnet GdTiO
Olivier Cepas, B. Sriram Shastry
We present a mean-field theory for magnetic field driven transitions in dipolar coupled gadolinium titanate GdTiO pyrochlore system. Low temperature neutron scattering…
Electric-Field-Induced Mott Insulating States in Organic Field-Effect Transistors
Olivier Cepas, Ross H. McKenzie
We consider the possibility that the electrons injected into organic field-effect transistors are strongly correlated. A single layer of acenes can be modelled by a Hubbard Hamilto…